Eck. Echo the other comments above - with accuracy like you got with the Fail safe, no reason on earth to change unless you just want to experiment.
The Oct. 2002 issue of Shooting Times Magazine had an excellent article on the various premium bullets on the market then. A number of comparison tests were run, penetration, wound channel diameter, retained weight of bullet when fired at different velocities, etc. Overall an excellent read. This is a one stop shopping source of info on premium bullets.
Regards.